two current carrying wires are placed next to each other. Their currents are moving in the same direction. Suggest why each wire experiences a force

According to the law of conservation of mass, in a chemical reaction the total starting mass of all the reactants equal the total final mass of all the products. true or false?

Which diagram correctly demonstrates the various forces acting on a ball moving horizontally with some speed?

Alead ball is dropped into a lake from a diving board 5m above the water . it hits the water with a certain velocity and then sink with constant velocity in bottom . it reaches the bottom 5 second after it is dropped if g= 10m/s2 . find depth of the lake and average velocity of the ball ?